Brush



Nov. 11, "1941. w, A, CHAPMAN Patented Nov. 11, 1941 OFFICE BRUSH Willis A. Chapman, Shaker Heights, Ohio, as-

signor of one-half to Wm. A. Spear, Cleveland,

Ohio

Application May 11, 1939, Serial No. 273,113

3 Claims.

This invention relates to brushes and is particularly applicable to circular brushes adapted to be mounted upon a rotatable spindle and driven by power, such as are used in many kinds of work.

An object of the invention is to provide an improved brush in which the bristles or filaments will be securely held against displacement.

Another object is to provide an improved brush which may be readily and economically manufactured.

Another object is to provide an improved brush which will be composed of few and simply produced parts.

Another object is to provide an improved brush which may be produced with filaments of various materials.

Another object is to provide an improved brush which will effectively hold relatively large masses of filaments or bristles.

Other objects will hereinafter appear.

The invention will be better understood from the description of two practical embodiments thereof, illustrated in the accompanying drawing, in which:

Figure 1 is a fragmentary perspective view of the component parts of one form of a brush embodying the invention, showing these parts in partly assembled relation;

Figure 2 is a fragmentary axial sectional view of a finished brush made of parts such as shown in Figure 1;

Figure 3 is a fragmentary transverse sectional view of the brush of Figure 2 taken on the line III-III thereof; and

Figure 4 is a View similar to Figure 3, showing another form of brush embodying the invention.

Referring first to the embodiment illustrated in Figures 1 to 3, a brush is shown which may be simply fabricated of only two elements besides the mass of filaments which are held thereby.

These elements are simply formed of sheet metal, or of sheet metal and tubing, or similar well known and easily handled materials, and may be caused by the present invention very firmly and securely to clamp the filaments in place.

The filaments themselves may be of any desired material, such as metal wire, whether this be round, fiat, or square in cross section, vegetable fibers, or animal fibers or bristles.

The brush illustrated in Figures 1 to 3 is proportioned in accordance with a brush which is just being put into commercial production and in which the fibers are of a vegetable material, commonly known as tampico.

The elements will be referred to as a hub and a ring. The former is shown in Figure 1 in the form of a cylindrical or tubular part I with aradial flange 2. These parts conveniently may be formed by fianging one edge of a short piece of tubing, or by drawing a cylindrical flange from a circular piece of sheet material.

The ring is illustrated at 3 having a circular cylindrical outer surface and an inner surface formed of a plurality of teeth or serrations 4 for a purpose to be hereinafter described. I

The surfaces of the hub and ring maf, if desired, be roughened as by knurling, or may be roughened by forming grooves or corrugations therein as described more fully in my copending application, Serial Number 200,461, filed April 6, 1938, now Patent Nuinber 2,241,845, May 13, 1941.

With the hub and ring formed as indicated in Figure 1, the filaments or bristles 5 are inserted in the ring 3. These filaments are bent upon themselves adjacent their center and are so arranged that their ends extend outwardly radially from the ring, while the central portion or bite passes through the ring overlying the inner surface thereof.

When a series of bristles, such as shown at 5 in Figure 1, have been assembled projecting through the ring, the series extending throughout its entire circumference, the cylinder I of the hub is inserted within these filaments, assuming the position shown in dot-and-dash lines in Figure 2, after which the end of this cylindrical portion l is flanged outwardly, as indicated by the arrows in Figure 2, to form a fiange 6 parallel to and of substantially the same dimensions as flange 2.

After this has been done, it will be apparent that the central portion of each filament is clamped tightly between the flanges 2 and 6, passing between the cylindrical portion I of the hub and the inner serrated surface 4 of ring 3.

Thus the central portion of these filaments is tightly compacted Within the hub and the axially extending portions of such filament lie within a space, most clearly shown in Figure 3 and indicated by the letter F, between the cylindrical portion l of the hub and the serrated surface 4 of ring 3.

The serrations of the ring prevent the circumferential displacement of this portion of the filaments, as any attempt to effect displacement wedges the group of filaments subjected thereto between the inclined surface of the serrations 4 and the cylindrical surface of part I, acting in the manner of a ball or roller ratchet to tightly firmly locked thereto.

lock these filaments against any Substantial circumferential motion.

In Figure 4 a brush is shown in which the cylindrical portion of the hub HJI, its flanges I02, and filaments I05 are identical to those in the brush previously described.

The ring within the hub I03 is provided on its interior with serrations I04 similar to the serrations above described, but is further provided with a plurality (shown as four) of lugs or prongs I01 which bear upon the exterior of cylindrical portion l0].

The lugs or prongs I01 accurately locate the ring I03 concentrically with cylindrical portion iill' of the hub. They further serve to divide the mass of filaments into a number of separated groups, aiding in the prevention of circumferential displacement of these filaments.

These lugs also assist in obtaining proper distribution of the filaments during assembling of the parts, by permitting the operator to insert substantially equal quantities of filaments between successive lugs.

In both forms of brush it is desirable that, when the second flange of the hub is formed, the inner cylindrical portion of the hub be expanded slightly, thus tightly compressing the filaments between the cylindrical portion of the hub and the ring, 1

In the embodiment shown in Figure 4, this expansion may also cause the lugs or prongs I to be forced into the material of the hub and thus Any roughing of the surfaces of the ring or hub serves to help in holding the filaments in place.

While I have described the illustrated embodiments of my invention in some particularity, obviously many others will readily occur tothose skilled in this art, and I do not, therefore, limit myself to the precise details shown and described,

' but claim as my invention all embodiments, variations," and modifications thereof coming within the scope of the appended claims.

I claim:

1. A circular brush comprising a hub having sides adapted to embrace between them centrally disposed portions of a series of filaments, a series of filaments each having a central portion looped within said hub and its ends extending outwardly therefrom, and a retaining ring in the hub and passing through the looped portions of said filaments, the ring having two series of inwardly extending projections, the projections of one series extending into contact with the hub and the projections of the other series being spaced therefrom and engaging the filaments to retain them against circumferential displacement.

2. A circular brush comprising a hub having sides adapted to embrace between them centrally disposed portions ofa series of filaments, a series of filaments each having a central portion looped within said hub and its ends extending outwardly therefrom, and a sheet metal retaining ring in the hub and having a circular external periphery andv a'serrated internal. periphery defined by a series of relatively shallowV-shaped serrations and passing through the looped portions. of said filaments and a plurality of inwardly directed prongs extending beyond said serrations toward the center of the ring.

3. A circular brush comprisinga hub having sides arranged to'embrace between them centrally disposed'portions of a series of filaments, a single sheet metal retaining. ring having a circular external periphery and a serrated internal periphery between said hub sides, a series ofzfilamerits each having a central portion looped through the retaining ring and having a portion passing between the ring and eachof the hub sides with the ends extending outwardly there- 

